Surgeon volumes among neurosurgeons and orthopedic surgeons who treated patients in Ontario with degenerative disease of the lumbar spine between Apr. 1, 1995, and Dec. 31, 2001
| Year | No. (%) of surgeons | Annual surgical volume | No. (%) of patients | ||||
|---|---|---|---|---|---|---|---|
| Low volume | High volume | Total | 75th percentile | Range | Low volume | High volume | |
| 1995 | 105 (73.9) | 37 (26.1) | 142 | 27.5 | 1–201 | 329 (39.5) | 504 (60.5) |
| 1996 | 106 (74.6) | 36 (25.4) | 142 | 29.5 | 1–214 | 366 (40.6) | 536 (59.4) |
| 1997 | 114 (74.5) | 39 (25.5) | 153 | 30.5 | 1–189 | 324 (36.4) | 565 (63.6) |
| 1998 | 114 (74.5) | 39 (25.5) | 153 | 31.5 | 1–156 | 355 (39.5) | 543 (60.5) |
| 1999 | 113 (74.8) | 38 (25.2) | 151 | 29.5 | 1–151 | 315 (35.2) | 579 (64.8) |
| 2000 | 107 (74.8) | 36 (25.2) | 143 | 35.5 | 1–160 | 364 (36.4) | 636 (63.6) |
| 2001 | 108 (75.0) | 36 (25.0) | 144 | 36.5 | 1–161 | 242 (34.0) | 470 (66.0) |
| 323* (34.0)* | 627* (66.0)* | ||||||
↵* Numbers adjusted by 4/3.